Connected: An Internet Encyclopedia
RFC 854 - CONNECTION ESTABLISHMENT

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### CONNECTION ESTABLISHMENT

The TELNET TCP connection is established between the user's port U and the server's port L. The server listens on its well known port L for such connections. Since a TCP connection is full duplex and identified by the pair of ports, the server can engage in many simultaneous connections involving its port L and different user ports U.

#### Port Assignment

When used for remote user access to service hosts (i.e., remote terminal access) this protocol is assigned server port 23 (27 octal). That is L=23.

Connected: An Internet Encyclopedia
RFC 854 - CONNECTION ESTABLISHMENT